Abstract
In an effort to define a future research agenda for gerontologically oriented cognitive training investigators, a number of issues crucial to the efficacy and utility of fluid (Gf) ability training with the aged are discussed. These issues involve (a) underlying mechanisms for fluid ability training, (b) individual differences in response to training, (c) practice effects in Gf performance, and (d) ecological validity. It is argued that these concerns have yet to be adequately understood as they bear on the modification of intellectual performance in elderly people and on the aging of intelligence.